After its launch on Friday, "about TWENTY THOUSAND PEOPLE (!!)" supplied "more testing" than the game had received in the past five years, according to Polytron programmer Renaud Bedard. "So, as it happens, bugs popped up. Some pretty serious."

Among the glitches: complete inoperability on older Xboxes with smaller hard drives; trouble running the game from a USB stick, and crashes in specific levels or situations. "In a rare situation (exiting the game from the "wall village" interiors), the save file becomes unusable," writes Bedard. "Nasty stuff."

Indeed. Bedard wants everyone to know they are working internally and with Microsoft to repair the issues. "It makes sense to issue a patch, but we don't currently have an ETA on it," he says. Meantime, if you have a problem, by all means email the Fez devs. "Lots of these problems have simple workarounds, so we can help you out, and email is easier than tweets," Bedard writes.